package com.wyc.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {

    // 定义2022年1月1日0.0.0的时间戳
    private static final long BEGIN_TIMESTAMP = 1640995200L;

    // 引入redis
    private StringRedisTemplate stringRedisTemplate;

    // 序列号的位数
    private static final int COUNT_BITS = 32;
    public RedisIdWorker(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    public Long nextId(String keyPrefix) {
        // 生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSeconds = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSeconds - BEGIN_TIMESTAMP;

        // 生成序列号
        // 获取当天日期，精确带day
        String date= now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        // 自增长
        long count = stringRedisTemplate.opsForValue().increment("icr" + keyPrefix + ":" + date);

        // 与或运算
        return timestamp << COUNT_BITS | count;
    }



}
